標題: Green phosphorescent iridium dendrimers containing dendronized benzoimidazole-based ligands for OLEDs
作者: Huang, Wei-Sheng
Lin, Jiann T.
Lin, Hong-Cheu
材料科學與工程學系
Department of Materials Science and Engineering
關鍵字: iridium complexes;dendrimers;phosphorescence;light-emitting diodes
公開日期: 1-Oct-2008
摘要: A series of novel non-conjugated functionalized benzoimidazole-based dendrimers containing peripheral benzyl ether type dendrons have been synthesized and characterized. These compounds undergo cyclometalation with iridium trichloride to form iridium(III) complexes. The emission wavelengths of these dendrimers are in the range from 510 to 530 nm, and the photoluminescence quantum yields (PLQYs) in the range from 0.45 to 0.80. Dendrimers (Gn)(2)Ir(acac) and (Gn)(3)Ir exhibit a reversible one-electron oxidation wave at similar to 0.55 V and similar to 0.37 V (vs. Ag/AgNO3), respectively. With a device configuration of indium tin oxide/poly(3,4-ethylenedioxythiophene):poly(styrene sulfonic acid)/4, 4'-bis(N-carbarzolyl)biphenyl:(G2)(3)Ir 20 wt% dopant/1,3,5-tris(2-N-phenyl-benzoimidazolyl)benzene/LiF/Al has a maximum external quantum efficiency (EQE) of 17.6% and a maximum current efficiency of 61.5 cd/A. (C) 2008 Elsevier B.V. All rights reserved.
URI: http://dx.doi.org/10.1016/j.orgel.2008.03.001
http://hdl.handle.net/11536/8265
ISSN: 1566-1199
DOI: 10.1016/j.orgel.2008.03.001
期刊: ORGANIC ELECTRONICS
Volume: 9
Issue: 5
起始頁: 557
結束頁: 568
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